On Wednesday, June 21, 2017, authorities in Beijing, Tianjin, and Hebei warned residents to prepare for a storm that could trigger flooding and possibly landslides. Flood warnings have become all too common in China: In 2013, more than 230 Chinese cities experienced floods. But Mother Nature is not entirely to blame; the cities’ outdated drainage systems are quickly overwhelmed and sprawling concrete gives stormwater runoff no place to go.